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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-777) A method for finding and tracking jobs from the new API
Date Mon, 14 Sep 2009 18:27:57 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-777?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12755124#action_12755124
] 

Owen O'Malley commented on MAPREDUCE-777:
-----------------------------------------

.bq As far as possible we shouldn't expose old interfaces through the new ones (e.g. ClusterStatus,
JobStatus, TaskReport) etc. in ClientProtocol, Cluster etc. I'm still debating if we should
deprecate JobStatus/TaskReport and replace them with newer ones in org.apache.hadoop.mapreduce
and making the old ones derive from the new ones. Maybe it's beyond the scope of this jira

We can't expose the old classes in the new API. In particular, it is critical that we can
have clients just use the new API with no references to the mapred package. To do that, as
Arun says, we need to move the functionality into the new API and have the old API extended
the new classes. (And be deprecated) I think that has to be in the scope of this jira since
this is the jira that is adding them to the new API.

> A method for finding and tracking jobs from the new API
> -------------------------------------------------------
>
>                 Key: MAPREDUCE-777
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-777
>             Project: Hadoop Map/Reduce
>          Issue Type: New Feature
>          Components: client
>            Reporter: Owen O'Malley
>            Assignee: Amareshwari Sriramadasu
>             Fix For: 0.21.0
>
>         Attachments: m-777.patch, patch-777-1.txt, patch-777-2.txt, patch-777-3.txt,
patch-777-4.txt, patch-777-5.txt, patch-777-6.txt, patch-777-7.txt, patch-777-8.txt, patch-777.txt
>
>
> We need to create a replacement interface for the JobClient API in the new interface.
In particular, the user needs to be able to query and track jobs that were launched by other
processes.

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